SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ee95da239260c78c81a1496ec0ad55f1c6b217ced2294e91bff777166d97c94' 
  AND token = '9dlR6TssL1owxwEpzYV0FXjBK0EvoK7OjaZiuJ5Svhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}